WO1999028674A1 - Water tube protective refractory structure and method of assembling the same - Google Patents

Abstract

A water tube protective refractory structure comprising between a water tube assembly and the combustion gas a refractory block provided along the outer surfaces of the water tubes and the outer surface of a planar rib, wherein the structure further comprises an arm projecting from the surface of the rib toward the refractory block and having a locking portion at the end thereof and a recess with which the locking portion is engaged, the refractory block is engaged detachably in a wall-mounted state with the water tube assembly via the arm and recess, and, wherein a meltable member meltable at a predetermined or higher temperature is put in the clearance between the arm and refractory block and melted during the operation to define a thermal expansion difference absorbing space, the water tube-side of the recess is opened a refractory sleeve is bonded to the recess, and the arm is engaged with the refractory sleeve to enable the refractory block to be drawn when press-molded.

Description

 Description Refractory structure for protecting water pipes and its assembling method

 The present invention relates to a refractory structure for protecting a water tube for protecting a water tube of a heat exchanger such as a water tube of a boiler from a high-temperature gas atmosphere, and a method of assembling the same. Background art

 In the waste heat recovery poiler, the water pipe for heat transfer is protected from the heat and corrosive atmosphere transmitted from the combustion gas by the refractory block.

 FIG. 19 to FIG. 21 show the prior art of such a refractory structure of a water pipe for a waste heat poirer. The technology shown in FIG. 19 is provided in Japanese Patent Application Laid-Open No. 9-184462, etc., wherein in FIG. 19, 11 denotes a water pipe of a poiler, and 13 denotes water pipes 11 to each other. Is a horizontal rib for connecting and reinforcing in the vertical direction.

 Reference numeral 26 denotes a fire block made of a ceramic material provided so as to cover the water pipe 11 from the combustion gas 50. The water pipe 11 is provided with heat transferred from the combustion gas 50 by the fire-resistant block 26. Protected from corrosive atmospheres.

 23 a is a bolt for fixing the fireproof block 26 to the flat rib 13. The port 23a is erected from the plate surface of the flat rib 13 through the refractory block 26, and is tightened with a nut 23b screwed to the port 23a. The block 26 is fixed to the water pipe 11 and the flat rib 13.

 Reference numeral 20 denotes a mortar, which is filled in a space formed between the inside of the refractory block 26 and the outside of the planar rib 13 and the water pipe 11. Reference numeral 27 denotes a cap, which is placed over the nut 23b so as to protect the head of the port 23a, that is, the threaded portion of the nut 23b from the combustion gas 50.

FIG. 20 to FIG. 21 are provided in Japanese Patent Application Laid-Open No. 9-23636, FIG. 20 is a sectional view perpendicular to the axis of the water pipe, and FIG. In the sectional view taken along the line A_A in FIG. is there. In FIGS. 20 to 21, 11 is a water pipe, 13 is a plane rib for connecting and reinforcing the water pipes 11, 36 is a water pipe 11, a plane rib 13, and a combustion gas 5. A fireproof block for protection from zero, 20 is a mortar filled between the fireproof block 36 and the planar ribs 13 and the water pipe 11.

 Reference numeral 38 denotes an arm for fixing the fireproof block 36 to the plane rib 13. The arm 38 protrudes from an appropriate position of the plane rib 13. The refractory block 36 is fixed to the water pipe 11 and the flat rib 13 by hooking the concave portion 37 of the refractory block 36 to the arm portion 38.

 Although not shown in the drawings, the invention of Japanese Utility Model Laid-Open No. Hei 11-066 (name of the device: water-cooled wall) as the above heat-resistant structure for protecting water pipes and the method disclosed in Japanese Patent Application Laid-Open No. Hei 7-225001 No. 6 (Title of Invention: Furnace wall structure of incinerator and refractory brick) is provided.

 The technique of the invention of the Japanese Utility Model No. 1 1 1 0 6 7 0 6 is that a flat metal plate that connects the water pipes is provided with a support metal that is formed to be inclined upward at a predetermined distance in the length direction of the water pipe. A protrusion is formed on the refractory block side so as to fit into the support metal, and a mortar is filled in a gap formed between the support metal and the recess. Have been.

 The technology disclosed in Japanese Patent Application Laid-Open No. 7-225016 discloses a plurality of coating portions having an arc-shaped cross section along the outer peripheral surface of a plurality of water pipes, and a connection for connecting the coating portions. A refractory block (refractory brick) composed of a plurality of portions. The refractory block has a plurality of protrusions for holding a gap required for filling mortar between the refractory block and the outer peripheral surface of the water pipe. Are provided at predetermined intervals in the pipe axis direction of the water pipe. Further, the fireproof block is provided with a mounting hole through which a mounting tool for mounting the water pipe is inserted into the connection portion.

 However, the prior art as described above has the following problems.

According to the technique provided in Japanese Patent Application Laid-Open No. Hei 9-184650 shown in FIG. 19, the bolt 23a becomes high in temperature during operation of the device and thermally expands. The cap 27 is pushed out toward the combustion gas 50 side and comes off the fitting portion. As a result, the bolts 23a and the nuts 23b are exposed in the combustion gas 50 and are easily corroded by the combustion gas 50. Then, as the corrosion progresses, the refractory block 2 6 will be damaged or dropped.

 Further, the refractory block 26 is fixed to the flat rib 13, and is fixed to the water pipe 11 and the flat rib 13 of the poiler via the erected bolt 23 a. There is a constraint due to the tightening of the bolt 23a, and in addition to this, thermal strain is generated due to a difference in thermal expansion between the water pipe 11 side and the refractory block 26. When such restraint or thermal strain occurs, the refractory block 26 is damaged by the thermal stress due to these and the thermal stress due to the difference in temperature between the inside and outside of the refractory block 26.

 Further, the technique provided in Japanese Patent Application Laid-Open No. 9-236203 shown in FIGS. 20 to 21 solves the problems of the prior art shown in FIG. However, in this technology, the arm block 38 protruding obliquely upward from the flat rib 13 is hooked on the concave section 3 7 formed in the fire block 36 so that the fire block 36 can be formed. Because of the support, it is difficult to securely fix the fireproof block 36 to the water pipe 11 and the flat rib 13, and the fireproof block 36 tends to fall off.

 Further, in the technique provided in Japanese Utility Model Laid-Open No. 1-106706, similar to the technique of Japanese Patent Application Laid-Open No. 9-236203, the support hardware projecting obliquely upward from the flat rib is used. It is difficult to securely fix the refractory block to the water pipe side because the refractory block is supported on the water pipe side only by hooking the recessed part of the refractory block into the water pipe side. Easy to occur.

 Further, in the technique provided in Japanese Patent Application Laid-Open No. Hei 7-22510, similar to the technique described in Japanese Patent Application Laid-Open No. Hei 9-184650, a mounting method for mounting a water pipe on a connecting portion of a fireproof block is used. Since the end of the fixture is exposed to the combustion gas, the fixture is corroded by the combustion gas, and if this corrosion proceeds, there is a problem that the refractory block is damaged or falls off.

Further, as in the prior art as described above, for example, the technique of Japanese Patent Application Laid-Open No. 9-236203 shown in FIGS. 20 to 21, the concave portion 37 of the refractory block 36 has a water pipe 1. In manufacturing a refractory block 36 that is formed to be inclined upward to hook the arm portion 38 on the first side, when the inclination angle is increased, the concave portion 37 is inclined upward. Since the mold cannot be removed, the refractory block 36 is molded by pressing Is impossible. In addition, a large angle of inclination is required to securely fix, but a large angle requires a special mold, which increases the manufacturing time and cost.

 Therefore, such a refractory block 36 is manufactured by pouring a refractory block material into a mold, and the method using such a method has a problem in that the strength is lower and the durability is inferior to those manufactured by press molding. Have.

 Further, in the above-mentioned conventional technology, for example, in the technology of Japanese Patent Application Laid-Open No. 9-236203, a metal arm 38 fixed to the water pipe 11 side and a refractory block 36 are provided. The space between them is filled with mortar 20, and the arm 38 and the refractory block 36 are fixed.

 However, the temperature of the portion filled with mortar 20 between the arm 38 and the refractory block 36 rises to 250: up to 500, and the temperature of the metal arm 38 and the The thermal expansion coefficient is significantly different from that of Tal 20. For this reason, the conventional technique has a problem that the mortar 20 is damaged by a difference in thermal expansion generated between the arm portion 38 and the mortar 20, and the durability of the refractory structure is reduced. I have.

 Further, in the above-mentioned conventional technology, a mortar for fixing the water pipe assembly and the fireproof block is cast, and when finishing the mortar to a required thickness, an operator needs a manual tool such as a trowel. The mortar is finished to the required thickness according to the worker's intuition. For this reason, in the prior art, the finish thickness of the mortar varies depending on the operator, and this causes a difference in the durability of a plurality of refractory blocks, thereby causing damage to the refractory blocks. Have a point. Disclosure of the invention

 The present invention solves the problems of the prior art as described above.

 That is, a first object of the present invention is to reliably fix a refractory block to a water pipe structure composed of a water pipe and a flat rib to prevent the fire block from being damaged or falling off.

A second object of the present invention is to make it possible to attach and remove a fireproof block at any part of the water pipe structure, thereby facilitating assembly and disassembly of the fireproof block. A third object of the present invention is to prevent the fire-resistant block and its mounting member from being damaged by thermal stress and from generating high-temperature corrosion, thereby improving their durability. A fourth object of the present invention is to obtain a fireproof block having high strength by enabling a fireproof block to be manufactured by press molding.

 A fifth object of the present invention is to prevent the mortar from being damaged due to a difference in thermal expansion between the mortar filled between the refractory block and the water pipe assembly and the water pipe assembly, and to improve the durability of the fire-resistant structure. It is to improve.

 Further, a sixth object of the present invention is to simplify the work of filling the mortar and reduce the number of steps for mounting the fireproof structure, and to fill the mortar with a uniform thickness between the water pipe assembly and the fireproof block. The purpose is to improve the strength of the mortar casting part. In order to achieve the above object, the present invention is constituted by the technical means of claims 1 to 12.

 That is, claim 1 is to protect a water pipe assembly composed of a plurality of water pipes and a flat rib connecting the water pipes from a combustion gas product. A water pipe protection fireproof structure provided with a fireproof block formed along the outer peripheral surface of the water pipe and the shape of the surface of the flat rib, wherein the fireproof block protrudes from the surface of the flat rib to the fireproof block side. The fireproof block has a concave portion with which the engaging portion of the arm is engaged, and the fireproof block has a concave portion with which the engaging portion of the arm portion is engaged. The fire proof block is configured to be detachable from the water pipe assembly.

 The second aspect of the present invention is the method according to the first aspect, wherein the engaging portion of the arm portion is bent from an end of the protruding portion toward the refractory block so as to be parallel and upward with respect to the water pipe. It is characterized by comprising a rising part that rises.

 A third aspect of the present invention is characterized in that, in the first aspect, a cross section orthogonal to the engaging portion of the arm portion is formed such that a cross-sectional area of the fireproof block is larger than that of the water pipe assembly side. I have.

More specifically, as described in claim 4, a cross section orthogonal to the engaging portion of the arm portion is formed such that a cross sectional area on the fireproof block side is larger than that on the water pipe assembly side. An engagement convex portion is provided, and on the other hand, on the fireproof block side, A corresponding engaging concave portion is provided, and the refractory block is fixed to the arm portion by engaging between the engaging concave portion and the convex portion.

 A fifth aspect of the present invention is the method according to the first aspect, wherein a combustion gas side convex portion and a water tube side convex portion facing the combustion gas side are provided at an upper end portion and a lower end portion of the refractory block, respectively. The combustion gas side projection and the water tube side projection of the refractory block are opposed to each other.

 Claim 6 is Claim 5, wherein the engaging portion of the arm portion is bent from an end of the protruding portion toward the fireproof block and stands parallel and upward to the water pipe. An upright rising portion, the recess of the fireproof block can be engaged with the rising portion from above by the gravity of the fireproof block, and the combustion gas side convex portion is provided at an upper end of the fireproof block. The water pipe side convex portion is provided at a lower end portion.

 According to the invention set forth in claims 1 to 6, the arm provided on the planar rib of the water pipe assembly is provided with the concave portion provided on the refractory block, and the gravity of the refractory block itself is used. Then, the fireproof block is fixed by hooking, so that a port and a nut which may protrude to the combustion gas side as in the prior art are not required, thereby suppressing the occurrence of high-temperature corrosion.

 In addition, since the arm has a rising part parallel to the water pipe, the gravity of the fire-proof block is used even when the water pipe assembly consisting of the water pipe and the flat rib forms the ceiling. And can be fixed in a detachable manner.

 Also, unlike the prior art, there is no need for tightening means such as ports and nuts, and the use of detachable fixing means eliminates the thermal constraint between the water pipe and the refractory block. As a result, the thickness of the refractory block can be reduced, the temperature difference between the inner and outer surfaces of the refractory block can be reduced, and the temperature rise of the refractory block can be suppressed, thereby reducing the thermal stress of the refractory block.

Furthermore, at the upper and lower ends of the refractory block, by making the combustion gas side of the upper end convex and the water pipe side of the lower end convex, the fireproof block can be locally, for example, one piece (one set). It can be removed. This makes it possible to easily repair parts of the refractory block, making maintenance easier. In addition, the upper and lower ends of the refractory block are alternately convexed on the combustion gas side and the water pipe side, so that a gap for thermal expansion of the refractory block is secured and high-temperature corrosion on the combustion gas side is ensured. It is possible to prevent the volatile gas from entering the water pipe and the fixing means comprising the arm portion and the concave portion.

 Claim 7 is the method according to claim 1, wherein a gap is formed between at least a distal end portion of the arm and the recess, and the gap melts when the arm reaches a predetermined temperature or higher. It is characterized in that a melting member is interposed.

 According to this invention, when the temperature of the metal arm constituting the water tube assembly reaches a predetermined temperature, that is, about 250 or more, during the operation of the apparatus, the molten member interposed in the gap melts. The void revives.

 Therefore, the gap becomes a space for allowing the expansion of the arm portion where the temperature becomes high, that is, a space allowing thermal expansion of the arm portion, and damage to the mortar due to a difference in thermal expansion between the arm portion and the mortar is avoided.

 The melting member is preferably filled with a rubber tape or paint.

 Claim 8 is to protect a water pipe assembly composed of a plurality of water pipes and planar ribs connecting the water pipes from a combustion gas product, between the water pipe assembly and the combustion gas. A water pipe protection fireproof structure provided with a fireproof block formed along the outer peripheral surface of the water pipe and the surface of the planar rib,

 An arm portion protruding from the surface of the flat rib toward the refractory block side and having an engaging portion formed at a tip thereof; and a concave portion opened to the flat rib side in the refractory block; A high-strength engaging member formed by press molding is adhered to the concave portion, and a refractory block is engaged and fixed to the arm portion via the engaging member.

 Claim 9 is the device according to claim 8, wherein the engaging member is a silica-based refractory material of the same type as the refractory block, and the adhesive is a high-temperature adhesive capable of withstanding the temperature of the engaging portion. It is characterized by.

According to the invention set forth in claims 8 and 9, when the fireproof block is attached to the arm portion of the water pipe assembly, the fireproof three is inserted into the concave portion opened to the flat rib side. The fireproof sleeve is fixed to the fireproof block by applying a high-temperature adhesive to its outer surface. Then, by engaging the arm portion with the inner surface of the fireproof sleeve, the fireproof block can be fixed to the water pipe assembly in a wall-mounted manner.

 Therefore, according to the invention, since the refractory block has no direct engagement portion with the arm portion and has a shape opened to the flat rib side, it is possible to remove the mold at the time of press molding. It can be manufactured.

 This makes it possible to obtain a press-molded refractory block having high strength. In particular, since a refractory sleeve made of SiC is used in the engaging portion, the strength is extremely improved.

 Since the refractory block is also made of silica-based refractory material such as alumina silica and SiC, it is made of the same material as the refractory sleeve.In other words, the coefficient of thermal expansion is similar, and there is no breakage due to thermal expansion strain. .

 Adhesives such as mortar phosphate and aron ceramic (trade name) are used because they do not degrade the adhesive performance even at high temperatures of 25 O or more, so there will be no deterioration in adhesion due to heat. .

 In order to protect a water pipe assembly composed of a plurality of water pipes and a flat rib connecting the adjacent water pipes from a combustion gas product, the claim Between the outer surface of the water pipe and the surface of the flat rib, a fire-resistant block is interposed, and the water pipe assembly and the fire-resistant block are fixed to each other with a mortar to protect the water pipe. In the method of assembling a refractory structure,

 In placing the mortar on the outer peripheral surface including the groove of the water pipe assembly, the mortar placing process is divided into a water pipe assembly side and a fireproof block side, respectively, and the fireproof block in which the mortar is cast into each of the predetermined portions. The water pipe assembly and the refractory block are fixed to each other by mortar by surface-attaching the water pipe assembly and the mortar after casting.

Claim 11 is the method according to claim 10, wherein the mortar setting positions of the water pipe assembly side and the refractory block side are groove portions surrounded by adjacent water pipes and plane ribs on the water pipe assembly side. In addition, on the refractory block side, a concave portion is formed in the circular inner peripheral surface of the refractory block facing the outer peripheral surface of the water pipe. According to the invention as set forth in claims 10 and 11, the mortar is not uniformly cast on the outer peripheral surface including the groove of the water pipe assembly, but the mortar casting step is performed by the water pipe assembly. Since the mortar is cast in the open space, the skill is not required because the mortar is cast in the open space, and the gauge of the scraper etc. The mortar can be cast with a predetermined thickness by using the mortar. Also, on both the water pipe assembly side and the refractory block side, since the groove side is the mortar casting position, the convex side (the straight surface facing the outer peripheral surface of the water pipe and the plane rib of the refractory block) is required. A scraper operation can be performed as a guide surface.

 Claim 12 is a water pipe assembly comprising a plurality of water pipes and a flat rib connecting the adjacent water pipes, and formed so as to conform to the shape of the outer peripheral surface of the water pipe and the surface of the flat rib. A water pipe protection comprising: a refractory block; an engaging portion projecting from the surface of the flat rib to the refractory block side; and a concave portion provided on the refractory block side and engaging with the engaging portion. In the method of assembling a refractory structure,

 A first mortar thickness regulating step of scraping off the excess mortar cast on the plane rib surface connecting the adjacent water pipes with a scraper using the outer peripheral surface of the water pipe as a guide,

 Removing the excess mortar cast between the circular concave surface of the refractory block facing the outer periphery of the water pipe with a scraper using the straight surface facing the flat rib of the refractory block as a guide. 2 mortar thickness regulation process,

 Performing a step of engaging the recesses of the refractory block after the mortar has been cast into the respective predetermined portions with the engaging portions on the side of the water pipe assembly through the mortar, while performing the step of surface-welding the two. It is characterized in that the aggregate and the refractory block are fixed by mortar.

According to the invention as set forth in claim 12, the excess amount of mortar cast in the groove-like portion surrounded by the space between the water pipes and the plane rib has an inner peripheral surface having an outer peripheral surface of the water pipe. A mortar placed between the outer periphery of the water pipe and the circular inner peripheral face of the fireproof block facing the outer periphery of the water pipe using a scraper formed in a circular shape in accordance with The excess is removed by a scraper using the straight surface facing the flat rib of the fireproof block as a guide. The scraper formed in the shape of a mortar removes the excess mortar, facilitating the work of removing excess mortar, and reducing the number of assembly steps of the fire-resistant structure for protecting a water pipe. In addition, since the scraper operation is performed using the outer peripheral surface of the water pipe and the straight portion of the fireproof block as guides, the mortar can be finished to an accurate thickness. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 shows the structure of a refractory structure for protecting water pipes in a waste heat recovery poiler of the present invention, and particularly in a first embodiment corresponding to claims 1 to 6, wherein It is sectional drawing orthogonal to the water pipe center of the refractory structure for water pipe protection.

 FIG. 2 is a sectional view taken along line BB of FIG.

 FIG. 3 is a sectional view corresponding to FIG. 1 showing a refractory structure for protecting a water pipe in the waste heat recovery poiler of the present invention, particularly a second embodiment corresponding to claims 1 to 6. is there.

 FIG. 4 is a cross-sectional view taken along the line CC of FIG.

 FIG. 5 shows an embodiment corresponding to claim 7, and is a view corresponding to a cross-sectional view taken along line BB of FIG.

 FIG. 6 is a sectional view taken along the line DD in FIG.

 FIG. 7 is an operation explanatory view corresponding to claim 7 and a sectional view corresponding to FIG. 5.

 FIG. 8 is a sectional view taken along the line EE in FIG.

 FIG. 9 shows an embodiment corresponding to claims 8 to 9 and corresponds to a cross-sectional view taken along the line BB of FIG.

 FIG. 10 is a sectional view taken along the line FF of FIG.

 FIG. 11 is a perspective view for explaining the operation of the embodiment corresponding to claims 8 to 9.

 FIG. 12 is a rear view showing a method for assembling a fireproof block according to an embodiment corresponding to claims 10 to 12.

FIG. 13 shows a method of assembling a refractory structure for protecting a water pipe in a waste heat recovery boiler according to the present invention, in particular, a procedure for removing an adhesive mortar according to claim 9. Is a view in the direction of an arrow perpendicular to the center line of the water pipe.

 FIG. 14 is a view in the direction of the arrows GG in FIG.

 FIG. 15 is a diagram corresponding to FIG. 13 of the embodiment corresponding to claims 10 to 12.

 FIG. 16 is a view in the direction of the arrows H—H in FIG.

 FIG. 17 is a perspective view showing a refractory block assembling procedure according to an embodiment corresponding to claims 10 to 12 of the present invention.

 FIG. 18 is a perspective view showing a finishing procedure at the time of assembling the refractory structure of the embodiment corresponding to claims 10 to 12.

 FIG. 19 is a cross-sectional view in a direction perpendicular to the center of a water pipe, showing a first example of the prior art. FIG. 20 is a cross-sectional view in a direction perpendicular to the center of a water pipe, showing a second example of the prior art. FIG. 21 is a sectional view taken along line AA of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, preferred embodiments of the present invention will be illustratively described in detail with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely described. It is only an example.

 FIGS. 1 and 2 show a first embodiment showing the structure of a refractory structure for protecting a water pipe in a waste heat recovery boiler of the present invention.

 In FIGS. 1 and 2, reference numeral 12 denotes a water tube assembly, which is composed of a plurality of rows of water tubes 11 and planar ribs 13 for connecting adjacent water tubes 11 in a horizontal or vertical direction.

 Reference numeral 16 denotes a refractory block, which is provided so as to cover the water pipe assembly 12 from the side of the combustion gas 50 on one side. The refractory block 16 is made of a heat-resistant material such as SiC having a relatively high thermal conductivity and a high heat resistance, and is formed by molding with a mold. It is covered so as to surround the 50 combustion gas 50 side.

The flat rib 13 has a predetermined pitch along the longitudinal direction (axial direction) of the water pipe 11. Thus, the arm portion 18 is erected toward the refractory block 16 side.

 As shown in FIG. 2, the arm portion 18 has a protruding portion 18b extending from the flat rib 13 in a direction perpendicular to the plate surface, and a flat rib 13 upward from the protruding portion 18b. And a rising portion 18a which is bent so as to be parallel.

 Further, the refractory block 16 is provided with the same number of concave portions 17 as the arm portions 18.

 Then, the refractory block 16 is engaged with the rising portion 18a of the arm portion 18 by using the gravity of the refractory block 16 via the mortar 20 with the rising portion 18a. , Mounted on a wall.

 As shown in FIG. 1, the arm portion 18 and the concave portion 17 provided corresponding to the arm portion 18 are preferably provided between the water tubes 11 as two sets of water tubes 11. However, three or more rows may be provided as one set.

 Mortar 20 is filled between the refractory block 16 and the water pipe assembly 12. Further, a mountain-shaped projection 21 is formed at the center of the inner periphery of the water tube envelope 16a of the refractory block 16, and a part of the outer periphery of the water tube 11 is applied to the top of the projection 21. The water pipe 11 and the refractory block 16 are securely positioned by contacting each other.

 Also, a gap filled with mortar 20 is formed between the left and right end portions 16 b of the adjacent refractory block 16, which serves as a relief for the thermal expansion of the refractory block 16 and reduces thermal stress. Is being planned.

 Further, the refractory block 16 is divided into a plurality of water pipes 11 in the horizontal direction as described above, but in the vertical direction, as shown in FIG. Direction) is also divided into an appropriate number. The upper and lower ends of each block 16 are an upper end 16 c where the combustion gas 50 side is convex, that is, a combustion gas side convex part, and a lower side where the water pipe 11 side is convex. The end 16 d, that is, the water tube side convex portion is alternately combined, and the gap between both ends is filled with mortar 20.

Further, as shown in FIG. 2, each set of the refractory blocks 16 is provided with a gas-side block 16 e facing the combustion gas 50 side over the entire height of the block 16. On the water pipe assembly 12 side of 16 e, the water pipe side block is located below the recess 17. A block 16 f is provided, and both blocks 16 e and 16 f are bonded at a joint 16 g. In addition, the refractory blocks 16 of each set can be attached and removed without being affected by the adjacent refractory blocks 16, that is, without moving the blocks 16. to, and sets the vertical direction clearance S There S _2, etc. with the upper end 1 6 c and the lower surface and the lower end portion 1 6 d of the mating proc.

 When mounting the refractory structure having such a configuration, the concave portion 17 of the refractory block 16 is provided on the arm portion 18 protruding from the planar rib 13, and the gravity of the refractory block 16 is viewed from above. Then, the mortar 20 is used to fix the wall. Therefore, according to this embodiment, bolts and nuts as in the prior art shown in FIG. 19 are not required, and occurrence of high-temperature corrosion of these members can be avoided. Then, when removing each fireproof block 16, remove the mortar 20 in the reverse order to the above, then lift the fireproof block 16 upward, and make the recess 17 the parallel part of the arm 18 (the rising part). ) Disengage with 18a and pull out the refractory block 16 to the combustion gas 50 side.

 As a result, even if the water pipe assembly 12 constitutes the ceiling, the refractory block 16 is attached to the water pipe structure 12 using its gravity, and is fixed so that it can be removed.

 Therefore, according to this embodiment, there is no need for the port and nut constrained portions as in the prior art, and since the fixing means can be disengaged for each set of the fireproof block 16, the water pipe assembly 12 and the fireproof block are prevented. As a result, the thickness of the fire-resistant block 16 becomes thinner, the temperature difference between the inner and outer surfaces of the fire-resistant block 16 is reduced, and the temperature rise is suppressed. Thus, the thermal stress of the refractory block 16 is reduced.

 The upper and lower ends of the refractory block 16 are formed so that the combustion gas 50 side of the upper end 16c is convex, and the water pipe structure 12 side of the lower end 16d is convex. As a result, it is easy to remove only one set of fire-resistant blocks 16 locally and repair them partially.

Further, the upper and lower ends 16c and 16d of the refractory block 16 are alternately protruded in the thickness direction, so that a gap S for thermal expansion of the refractory block 16 is formed. While ensuring S _2, can be prevented from entering the locking means (the arm portion 1 8, etc.) side of the high-temperature corrosive gas water tube assembly 1 2及patron from the combustion gas 5 0 side. FIGS. 3 and 4 show a second embodiment of the present invention.

 3 to 4, the planar ribs 13 of the water pipe structure 12 of the boiler project from the planar ribs 13 toward the refractory block 16 at a predetermined pitch along the vertical direction. An arm portion 19 is provided so that the cross-sectional area increases as the distance increases. The cross-sectional area of the arm portion 19 may be formed so as to increase rapidly at a position where a portion protruding toward the refractory block 16 is present. The refractory block 16 is provided with a recess 17 corresponding to the arm 19, so that the recess 17 can be engaged with the arm 19 via a mortar 20. ing.

 The arm portion 19 and the concave portion 17 are formed horizontally (perpendicular to the plate surface of the flat rib 13) as shown in FIG. With this configuration, the refractory block 16 is firmly fixed to the planar rib 13 on the water pipe 11 side.

 Structures other than the above are the same as those of the first embodiment shown in FIGS. 1 and 2, and the same members are denoted by the same reference numerals.

 5 to 8 show a third embodiment of the present invention.

 In these figures, reference numeral 18 denotes an arm protruding from the planar rib 13 of the water pipe assembly 12 and, similarly to the first embodiment shown in FIGS. The projection 18 includes a protruding portion 18b extending perpendicularly to the plate surface and a rising portion 18a bent upward from the protruding portion 18b.

 Reference numeral 17 denotes a recess formed in the refractory block 16 and has a shape in which the arm 18 can be engaged similarly to the first embodiment.

 In this embodiment, as shown in FIGS. 5 and 6, a gap between the rising portion 18a mainly of the arm portion 18 and the inner surface of the concave portion 17 of the refractory block 16 is formed. The molten member 51 is filled.

The melting member 51 is made of a material that melts when the temperature of the arm portion 18 reaches at least 250, and is loaded with a rubber tape that melts at a temperature of 250. Alternatively, it is preferable to apply a coating material that melts at a temperature of 25 Ot: on the outer surface of the arm portion 18. Mortar 20 is cast on a portion other than the portion where the melting member 51 is interposed. In the third embodiment, when the temperature of the arm portion 18 constituting the water pipe assembly 12 rises to about 250 during operation of the apparatus, as shown in FIGS. 7 to 8, The melting member 51 is melted by the heat transmitted from the arm 18, and the gap 51 a is restored between the outer surface of the arm 18 and the inner surface of the recess 17. The gap 51a is formed along the outer periphery of the arm 18 as shown in FIGS.

 Therefore, the space 51 a becomes a space (thermal expansion allowance) allowing the thermal expansion of the arm portion 18 where the temperature is high, and the thermal expansion difference between the arm portion 18 and the refractory block 16 is reduced. The mortar 20 is prevented from being absorbed and conventionally caused by such a difference in thermal expansion.

 Other configurations are the same as those of the first embodiment shown in FIGS. 1 and 2, and the same members are denoted by the same reference numerals.

 9 to 11 show a fourth embodiment of the present invention.

 In these figures, 13 is a plane rib of the water pipe assembly 12, 18 is a force protruding from the plane rib 13, and is composed of a vertical portion 18 b and a rising portion 18 a, and is bent upward. Arm. The structures of the planar ribs 13 and the arm portions 18 are the same as those of the first embodiment shown in FIGS.

 52 is a refractory sleeve. The refractory sleeve 52 is made of a refractory material such as SiC similar to the refractory block 16. As shown in FIGS. 9 to 11, the refractory sleeve 52 has openings 52 c and 52 a on its lower side, that is, on the side of the arm 18 and the side of the flat rib 13, respectively. A groove 52b is formed, and the arm 18 is fitted into the groove 52b.

 On the other hand, the fireproof block 16 is formed with a concave portion 54 having an opening on the water tube assembly 12 side, and the fireproof sleeve 52 is fitted to the concave portion 54 on the outer surface thereof. Then, the fireproof sleeve 52 is coated with a high-temperature adhesive 53 having high bonding performance even at high temperatures on the outer surface thereof, and is bonded to the concave portion 54 of the fireproof block 16.

As the high-temperature adhesive 53, use is made of an adhesive such as mortar phosphate, aron ceramic or the like, whose adhesive performance does not decrease even at a high temperature of 250 or more. In the above embodiment, when the refractory block 16 is attached to the water pipe assembly 12, as shown in FIGS. 9 to 10, the concave portion of the refractory block 16 opened to the side of the flat rib 13. A refractory sleeve 52 is inserted into the flat rib 13 from the side of the flat rib 13, and a high-temperature adhesive 53 is applied to the outer surface thereof, and is adhered and fixed to the inner surface of the concave portion 54 of the refractory block 16. Next, as shown in FIG. 11, the rising portion 18a of the arm 18 is inserted from the lower opening 52c of the refractory sleeve 52 fixed to the refractory block 16 with the high-temperature adhesive 53. Then, the refractory block 16 and the refractory sleeve 52 are lowered, and the rising portion 18 a of the arm 18 is fitted into the groove 52 b of the refractory sleeve 52.

 At the time of such fitting, since the refractory sleeve 52 has the opening 52 a on the side of the planar rib 13, the arm 18 is smoothly fitted into the groove 52 b of the refractory sleeve 52.

 After the fitting, as shown in FIG. 9 to FIG. 10, the inner convex portion 52 d of the refractory sleeve 52 causes the rising portion 18 a of the arm portion 18 to have the flat rib 13 side of the rising portion 18 a. The arm portion 18 and the refractory sleeve 52 are securely fitted to each other without being displaced and pulled out.

 As described above, after the arm portion 18 is fitted to the refractory sleeve 52, the mortar 20 is cast in the gap around the refractory block 16.

 Therefore, according to this embodiment, the recess 54 of the refractory block 16 has a shape opened to the side of the flat rib 13 without forming a fitting portion with the arm 18, so that the press molding is performed. The die can be easily removed at the time, so that the refractory block 16 can be manufactured by press molding.

 Next, a method of assembling the water pipe protecting refractory structure will be described with reference to FIGS. 12 to 18.

 (1) First, when fixing the fireproof block 16 to the water pipe assembly 12 including the water pipe 11, as shown in Fig. 12, the fire pipe block 16a at the bottom of the bottom row is first assembled into the water pipe. Fix it to the body 12, then fix the second row 16b from the bottom, and then stack the upper refractory blocks 16 on top.

(2) Set the expansion gauge in the direction of thermal expansion of the water pipe 11 Attach every four. The expansion gauge is inserted to take the expansion allowance.

 (3) As shown in FIG. 13 to FIG. 14, mortar 20 is cast on the flat rib 13 between the water pipes 11. The mortar 20 is finished to a required thickness t i (about 10 mm) with a scraper 55 in the following manner.

 As shown in FIGS. 13 to 14, the scraper 55 has an inner surface 55 a formed in a circular surface having the same shape as the outer peripheral surface of the water pipe 11, and the circular surface 5 a. A plane 55b is formed between 5a and 55a so that the mortar 20 can be finished to the required thickness ti (= 10 mm).

 After the mortar 20 is cast between the water pipe assembly 12 and the refractory block 16 as described above, the circular surface 55 a of the scraper 55 is connected to the outer surface of the water pipe 11. Then, the scraper 55 is moved in the longitudinal direction of the water pipe 11 as shown by an arrow in FIG. 14 using the outer surface of the water pipe 11 as a guide.

 By such an operation, the excess portion of the mortar 20 is cut off by the plane 55b of the scraper 55, and the mortar 20 is correctly finished to the required thickness ti.

 (4) Next, as shown in FIGS. 15 to 16, mortar 20 is cast on the circular inner surface 16 n of the refractory block 16.

The mortar 20 is finished to a required thickness t ₂ (about 5 mm) with a scraper 56 in the following manner.

 As shown in FIGS. 15 to 16, the scraper 56 has circular convex surfaces 56 b and 56 b formed to have the same diameter as the outer surface of the water pipe 11. The circular convex surfaces 56b, 56b are connected to the straight surface 56a.

When the straight surface 56 a of the scraper 56 comes into contact with the straight surface 16 m of the fireproof block 16, the circular convex surface 56 b and the inner surface 16 n of the fireproof block 16 mortar 2 0 of required thickness t ₂ (= 5 mm) is to be filled, the relationship dimension between straight-like surface 5 6 a circular convex surface 5 6 b is set between.

After placing mortar 20 on the inner surface 16 n of the refractory block 16, the straight surface 56 a of the scraper 56 was in contact with the straight surface 16 m of the refractory block 16. Using the straight surface 16 m as a guide, as shown by the arrow in FIG. The tube 11 is moved in the longitudinal direction.

With such an operation, the excess thickness portion of the mortar 2 0 is dropped can搔by a circular convex surface 5 6 b of scraper 5 6, the mortar 2 0 Ru finished properly required thickness t _2.

 (5) Next, as shown in FIG. 17, the refractory block 16 is pulled down together with the mortar 20 while pushing it toward the flat rib 13 side in the longitudinal direction of the water pipe assembly 12 to form the flat rib 13. Hang it on the protruding arm section 18.

 (6) As shown in Fig. 18, the back of the refractory block 16 is hit with a plastic hammer 58, and the refractory block 16 is strongly attached to the water pipe assembly 12 via mortar 20. Adhere.

 At this time, the bonding operation by hitting the hammer 58 is performed first on the center of the refractory block 16, then on the upper and lower portions of the refractory block 16, and on the left and right sides.

After fixing the refractory block 16 to the water pipe assembly 12 as described above, the thickness of the mortar 20 is measured using a gauge 57 as shown in FIG. 18, and this is the required thickness. to make sure that it is a t _3. The invention's effect

 As described above, according to the present invention, the following effects can be obtained. That is, the recess provided in the refractory block can be fixed to the arm provided on the flat rib of the water pipe assembly from above using the gravity of the refractory block in a wall-mounted manner. Thus, the refractory block can be easily and securely fixed in a detachable state. This makes it possible to securely fix the fireproof block in any part of the water pipe in a detachable state.

 In addition, since the refractory blocks can be disengaged one by one, partial repair of the blocks can be easily performed, thereby improving maintainability.

In addition, the arm on the water pipe assembly side and the recess on the fireproof block side can be fixed in a detachable manner without using a tightening means such as a power nut, so that the thermal connection between the water pipe structure and the fireproof block The temperature is reduced by the thinning of the refractory block The difference and temperature are reduced and the thermal stress is reduced.

 Further, since no tightening means such as a port or a nut is required as described above, there is no projecting portion into the high-temperature corrosion environment, and the occurrence of high-temperature corrosion can be prevented.

 Thus, a refractory structure having improved durability can be obtained.

 In particular, according to claim 7, during operation of the device, the melting member interposed in the gap between the arm portion and the concave portion of the refractory block is melted, the gap is restored, and the heat of the arm portion is restored. Since it becomes an expansion allowance, it is possible to prevent the mortar from being damaged due to a difference in thermal expansion between the arm portion and the mortar.

 Further, according to claims 10 to 12, the mortar casting step is divided into the water pipe assembly side and the fireproof block side separately, and in other words, mortar casting in an open space. The mortar is not required to be performed because the mortar is performed, and the open space allows the mortar to be cast with a predetermined thickness using a gauge such as a scraper. Since the groove side is the mortar setting position on both the water pipe assembly side and the fireproof block side, the convex side (the straight surface facing the outer peripheral surface of the water pipe and the plane rib of the fireproof block) is guided. It becomes possible to perform a scraper operation as a surface.

 In particular, the excess amount of mortar cast between the water pipe assembly and the fireproof block is reduced by a scraper having a concave inner shape guided by the outer circumference of the water pipe and the straight surface of the fireproof block. Since the mortar is removed, the work of removing the excess mortar is easy, and the man-hour for assembling the equipment can be reduced.In addition, the mortar has an accurate finished thickness, and the mortar has uneven strength and the durability of the fireproof block. Can be prevented from decreasing.

Claims

The scope of the claims 1. In order to protect a water pipe assembly including a plurality of water pipes and a flat rib connecting the water pipes from a combustion gas product, an outer peripheral surface of the water pipe and an outer peripheral surface of the water pipe are provided between the water pipe assembly and the combustion gas. In a water pipe protection refractory structure provided with a refractory block formed so as to conform to the shape of the surface of the planar rib, an engaging part is formed at a tip end of the refractory block protruding from the surface of the planar rib. The fireproof block includes a recessed portion in which the engaging portion of the arm portion is engaged, and the fireproof block is disengaged from the water pipe assembly via the arm portion and the recessed portion. A fire-resistant structure for protecting a water pipe, wherein the structure is made possible. 2. The engaging portion of the arm portion comprises a rising portion which is bent from an end of the projecting portion toward the refractory block side and rises parallel and upward to the water pipe. 2. The fire-resistant structure for protecting water pipes according to claim 1.  3. The water pipe protection according to claim 1, wherein a cross section orthogonal to the engagement part of the arm part is formed so that a cross sectional area on the refractory block side is larger than that on the water pipe assembly side. For refractory structures.  4. A cross section orthogonal to the engaging portion of the arm portion is provided with an engaging convex portion formed so that the cross-sectional area of the refractory block side is larger than that of the water pipe assembly side. 4. The water pipe protection according to claim 3, wherein an engagement concave portion corresponding to the area is provided, and the fireproof block is fixed to the arm portion by engaging between the engagement concave portion and the convex portion. For refractory structures.  5. A combustion gas side projection and a water pipe side projection facing the combustion gas side are respectively provided at the upper end and the lower end of the refractory block, and the combustion gas side projection of the refractory block located vertically adjacently. 2. The fire-resistant structure for protecting a water pipe according to claim 1, wherein the water pipe-side convex part and the water pipe-side convex part are opposed to each other. 6. The engaging portion of the arm portion is bent from the end of the projecting portion toward the refractory block side. The fire-resistant block has a rising portion that rises in parallel and upward with respect to the water pipe, and the recessed portion of the fire-resistant block can be engaged with the rising portion from above by the gravity of the fire-resistant block. 6. The water pipe protecting refractory structure according to claim 5, wherein the combustion gas side projection is provided at an upper end, and the water pipe side projection is provided at a lower end.  7. A gap is formed between at least the distal end portion of the arm and the recess, and a melting member that melts when the arm reaches a predetermined temperature or more is interposed in the gap. 2. The water pipe protection refractory structure according to claim 1.  8. In order to protect a water pipe assembly including a plurality of water pipes and planar ribs connecting the water pipes from a combustion gas product, an outer peripheral surface of the water pipe and an outer peripheral surface of the water pipe are provided between the water pipe assembly and the combustion gas. In a fire protection structure for water pipe protection provided with a fire protection block formed along the shape of the surface of the planar rib,  An arm portion protruding from the surface of the flat rib to the fireproof block side and having an engagement portion formed at a tip thereof; and a concave portion opened to the flat rib side is formed on the fireproof block. A refractory structure for protecting a water pipe, wherein a high-strength engaging member formed by press molding is adhered to the concave portion, and a refractory block is engaged and fixed to the arm portion via the engaging member.  9. The engagement member according to claim 8, wherein the engagement member is a silica-based refractory material of the same type as the refractory block, and the adhesive is a high-temperature adhesive capable of withstanding the temperature of the engagement portion. Refractory structure for water pipe protection.  10. In order to protect a water pipe assembly composed of a plurality of water pipes and a flat rib connecting the adjacent water pipes from a combustion gas product, the water pipe assembly is provided between the water pipe assembly and the combustion gas. A method for assembling a water pipe protecting fire resistant structure comprising a fire resistant block formed so as to conform to the shape of the outer peripheral surface and the surface of a planar rib, and fixing the water pipe assembly and the fire resistant block with mortar. ,  In placing the mortar on the outer peripheral surface including the groove of the water pipe assembly, the mortar placing process is divided into the water pipe assembly side and the fireproof block side, respectively. The refractory block in which mortar is cast in each of the predetermined portions and the water pipe assembly are surface-bonded via the mortar after casting, so that the water pipe assembly and the fireproof block A method for assembling a refractory structure for protecting a water pipe, comprising:  1 1. The mortar placement positions of the water pipe assembly side and the fireproof block side  On the water pipe assembly side, it is a groove-shaped part surrounded by adjacent water pipes and flat ribs, and on the fire-resistant block side, it is a concave part on the circular inner peripheral surface of the fire-resistant block facing the water pipe outer peripheral surface. The method for assembling a water pipe protecting refractory structure according to claim 10. 12. A water pipe assembly including a plurality of water pipes and a flat rib connecting the adjacent water pipes, a fireproof block formed along the outer peripheral surface of the water pipe and the surface shape of the flat rib, and the flat face. A method for assembling a water pipe protection refractory structure, comprising: an engaging portion protruding from the surface of a rib toward the refractory block; and a recess provided on the refractory block and engaging with the engaging portion. At  A first mortar thickness regulating step of scraping off the excess mortar cast on the plane rib surface connecting the adjacent water pipes with a scraper using the outer peripheral surface of the water pipe as a guide,  Removing the excess mortar cast between the circular concave surface of the refractory block facing the outer periphery of the water pipe with a scraper using the straight surface facing the flat rib of the refractory block as a guide. 2 mortar thickness regulation process,  Performing a step of engaging the concave portion of the fireproof block after the mortar has been cast into each of the predetermined portions with the engaging portion on the side of the water pipe assembly through the mortar to face the two together. A method for assembling a water pipe protecting refractory structure, comprising fixing an assembly and a refractory block with mortar.